the stream on which the gain is being changed.
the gain. 1.0f is no change, 0.0f is silence.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: It is safe to call this function from any thread, as it holds a stream-specific mutex while running.
Change the gain of an audio stream.
The gain of a stream is its volume; a larger gain means a louder output, with a gain of zero being silence.
Audio streams default to a gain of 1.0f (no change in output).
This is applied during SDL_GetAudioStreamData, and can be continuously changed to create various effects.